// Copyright (C) 2019-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }

#include <type_traits>

using namespace std;

static_assert( is_same_v<common_reference<int>::type,
			 common_reference_t<int>>);
static_assert( is_same_v<common_reference<int&, const int&>::type,
			 common_reference_t<int&, const int&>>);
static_assert( is_same_v<common_reference<int, long&, char, unsigned&>::type,
			 common_reference_t<int, long&, char, unsigned&>>);
